Fundamentals BroadNet answer

What is an SMS API?

Last reviewed September 30, 20261 min readReviewed by BroadNet engineering

Quick answer

An SMS API is a REST or SMPP endpoint that enterprise applications call to send SMS messages programmatically. It abstracts the SMSC, the operator connections, the SS7 signalling, and the regulatory compliance — exposing a simple POST /messages or SMPP submit_sm command.

Plain-language definitionVendor-neutralReviewed September 30, 2026

DiagramHow an A2P message reaches the phone

Your applicationSends over the REST API or SMPP
BroadNet platformValidates, routes and bills each message
Operator SMSCDirect operator connection
Subscriber handsetThe message is delivered

The delivery receipt (DLR) travels back along the same path to your webhook

The long answer

Everything worth knowing, nothing that isn't.

§01

REST vs SMPP

REST (HTTPS POST) has no fixed per-account rate limit at BroadNet — throughput is sized to your traffic. SMPP 3.4 binding suits sustained volumes of several hundred messages per second or workloads that need persistent binds (capacity per bind agreed with your account team, up to 30,000 SMS/s per node) — typically OTP services, large e-commerce, or operator-level traffic.

BNWritten by the BroadNet engineering team·Operating carrier-grade messaging since 2003, headquartered in Dubai·Editorial standards

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References

Source documents we cite.

Standards bodies and regulators referenced in this page. Open in a new tab.

3GPP TS 23.040 (SMS technical realization)

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